Please read the instructions and familiarize yourself with the attached files and the 2 Easel files and also the referenced Spring Joint Box link below:
This box is designed with a .125" bit in mind and a sheet of quarter inch MDF measuring 24" by 24" by .238" thick. Take some time to clamp this sheet down tightly and square to the X/Y axis.
Click the “Open in Easel” button above to open the first file for cutting. Step through the process of carving the material.
Open the following link to the cut through file in Easel and step through the process of carving the material.
This step should be self explanatory, but just in case you need some extra guidance, follow this link to the instructions over at Popular Woodworking